classdef attraction < handle
properties
particle_1
particle_2
strength
minimum_distance
graphics_handle
end
methods
function Attraction = attraction (Particle_System, particle_1, particle_2, strength, minimum_distance)
%ATTRACTION Attraction object constructor.
%
% Examples
%
% A = ATTRACTION (PS, P1, P2) creates attraction A between two particles
% P1 and P2 with default properties:
% strength: 1
% minimum_distance: 0
% and appends it to the particle system PS
%
% A = ATTRACTION (PS, P1, P2, S, M) creates attraction A between
% two particles P1 and P2 with the following properties:
% strength: S
% minimum_distance: M
% and appends it to the particle system PS
% Copyright 2008-2008, buchholz.hs-bremen.de
if nargin == 3
strength = 1;
minimum_distance = 0;
end
Attraction.particle_1 = particle_1;
Attraction.particle_2 = particle_2;
Attraction.strength = strength;
Attraction.minimum_distance = minimum_distance;
Attraction.append (Particle_System);
end
function delete (Attraction)
%DELETE Delete attraction.
%
% Example
%
% DELETE (A) deletes the attraction A.
% Copyright 2008-2008 buchholz.hs-bremen.de
if ishandle (Attraction.graphics_handle)
delete (Attraction.graphics_handle)
end
end
function update_graphics_position (Attraction)
%UPDATE_GRAPHICS_POSITION Update the graphical attraction representation.
%
% Example
%
% UPDATE_GRAPHICS_POSITION (A) updates the position of the
% graphical representation of the attraction A.
% Copyright 2008-2008 buchholz.hs-bremen.de
attraction_position(1, 1:3) = Attraction.particle_1.position;
attraction_position(2, 1:3) = Attraction.particle_2.position;
set (Attraction.graphics_handle, ...
'xdata', attraction_position(:, 1), ...
'ydata', attraction_position(:, 2), ...
'zdata', attraction_position(:, 3));
end
end
methods (Access = 'private')
function append (Attraction, Particle_System)
%APPEND Append attraction to particle system.
%
% Example
%
% APPEND (A, PS) appends the attraction A to the
% particle system PS.
% Copyright 2008-2008 buchholz.hs-bremen.de
figure (Particle_System.graphics_handle)
attraction_position(1, 1:3) = Attraction.particle_1.position;
attraction_position(2, 1:3) = Attraction.particle_2.position;
Attraction.graphics_handle = ...
line (...
attraction_position(:, 1), ...
attraction_position(:, 2), ...
attraction_position(:, 3), ...
'color', [0 0 1], ...
'linestyle', ':');
Particle_System.attractions = [Particle_System.attractions, Attraction];
end
end
end
